A man was arrested Monday after his off-leash pit bull attacked a U.S. Park Police officer and his horse in Crissy Field.

The dog was barking at the officer and his horse while they were on a routine patrol near the West Bluff area of Crissy Field, said National Park Service spokesman Howard Levitt. The officer asked the man to control his pit bull, but he did not comply.

The dog then bit the horse’s stomach and rear leg, Levitt said. The horse fell, bringing the officer down as well.

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The horse tried to escape and ran toward the Presidio. The pit bull followed, but was kicked away by the horse.

A few minutes later, another Park Police officer near the Lincoln Boulevard underpass of Presidio Parkway spotted the dog.

Animal Care and Control was called and took possession of the dog, Levitt said.

“The horse had a number of stitches to close a stomach wound and a leg wound, and the officer was badly bruised and shaken,” Levitt said. “Fortunately, neither of their injuries were life-threatening.”

The dog’s owner was arrested and booked on several charges, including failure to maintain control of a dog and assault on a police officer.